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The influence of internal individual constraints on the performance of young soccer players

Grant number: 13/24193-2
Support Opportunities:Regular Research Grants
Duration: March 01, 2014 - February 29, 2016
Field of knowledge:Health Sciences - Physical Education
Principal Investigator:Alexandre Moreira
Grantee:Alexandre Moreira
Host Institution: Escola de Educação Física e Esporte (EEFE). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated researchers: Aaron James Coutts ; Marcelo Saldanha Aoki


The soccer game is characterized by several interactions which affect the performance. Therefore it may be conceptualized as a complex phenomenon. In light of the dynamical systems theory, the spontaneous pattern formation between component parts through processes of self-organization emerges as one of the main study´s subjects regarding the performance analysis in this sport. Self-organization is manifested as transitions between different organizational states emerging due to internal and external constraints pressurizing system components into change. Despite the recent growing in recognizing the importance of this approach based on the functional perspective for soccer performance analysis there is still a paucity of information concerning performance assessment from within the competitive environment in young soccer players, as well as in regard the influence of internal constraints on movement patterns, game skills and physiological responses of such population. The analysis of match performance and the influence of the internal constraints on movement patterns may be an important progression for understanding the aspects regarding the talent development and for researching talent identification. Therefore, the present study aims to identify the influence of internal constraints on tactical and individual game-specific skills of young soccer players at different time-points from an entire competitive season. An additional aim of the study is to verify the association between game-specific skills ("involvements") and responses of hormonal and immune markers as well as with behavior measures. Approximately, 56 participants will be recruited from two separate under-14 and under-15 youth squats. The study will be divided into study 1 and study 2. In the study 1, forty soccer players from one of these squads will be assessed at three time-points during an entire competitive season. Measures of hormonal profile, anthropometrical maturity, physical tests performance, and tactical movement patterns as well as game-specific skills and phyisical performance during small-sided-games will be conducted. In the study 2, sixteen participants will be assessed. They will be involved in seven official soccer matches which will take place within a week. All matches will be recorded and the game-specific skills will be retained for analysis. Rest cortisol, testosterone and immunoglobulin A concentrations as well as their responses to the matches will be assessed. Rating of perceived effort for each match will be recorded. Moreover, the participants will fill the DALDA (stress tolerance) and WURSS-21 (symptoms of upper respiratory infections) questionnaires on a daily basis. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ZANETTI, VINICIUS; CARLING, CHRISTOPHER; AOKI, MARCELO S.; BRADLEY, PAUL S.; MOREIRA, ALEXANDRE. Are There Differences in Elite Youth Soccer Player Work Rate Profiles in Congested vs. Regular Match Schedules?. JOURNAL OF STRENGTH AND CONDITIONING RESEARCH, v. 35, n. 2, p. 473-480, . (13/24193-2)
MOREIRA, ALEXANDRE; BRADLEY, PAUL; CARLING, CHRISTOPHER; SCHULTZ ARRUDA, ADEMIR FELIPE; SPIGOLON, LEANDRO M. P.; FRANCISCON, CLOVIS; AOKI, MARCELO SALDANHA. Effect of a congested match schedule on immune-endocrine responses, technical performance and session-RPE in elite youth soccer players. JOURNAL OF SPORTS SCIENCES, v. 34, n. 24, p. 2255-2261, . (13/24193-2)
ARRUDA, ADEMIR F. S.; CARLING, CHRISTOPHER; ZANETTI, VINICIUS; AOKI, MARCELO S.; COUTTS, AARON J.; MOREIRA, ALEXANDRE. Effects of a Very Congested Match Schedule on Body-Load Impacts, Accelerations, and Running Measures in Youth Soccer Players. INTERNATIONAL JOURNAL OF SPORTS PHYSIOLOGY AND PERFORMANCE, v. 10, n. 2, p. 248-252, . (13/24193-2)
ZANETTI, VINICIUS; AOKI, MARCELO SALDANHA; BRADLEY, PAUL; CARLING, CHRISTOPHER; MARINO, THOMAS KISIL; MOREIRA, ALEXANDRE. Running Performance and Hormonal, Maturity and Physical Variables in Starting and Non-Starting Elite U14 Soccer Players During a Congested Match Schedule. Journal of Human Kinetics, v. 80, n. 1, p. 287-295, . (12/20309-3, 13/24193-2)

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